I use the Avery 5160 labels a lot. They don't smear, they stick, and they are easy to use. Some of the offbrands are really quite inferior and when trying to look professional, the last thing I want is a smeary looking label.
We use alot of MAiling Labels and these are the best. We are able to get our company logo on the label, plus get all the information on the label. We could not do our job without the labels.